mfd: Add SuperH Mobile SDHI platform driver

This patch adds an MFD driver for the SuperH Mobile SDHI
hardware block. At this point the driver simply wraps the
tmio-mmc driver with some clock code. In the future this
driver is the place to put SDHI specific hotplug code.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 154 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 570be139f9df..96956b3cc178 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -35,6 +35,14 @@ config MFD_ASIC3
           This driver supports the ASIC3 multifunction chip found on many
           PDAs (mainly iPAQ and HTC based ones)
 
+config MFD_SH_MOBILE_SDHI
+        bool "Support for SuperH Mobile SDHI"
+        depends on SUPERH
+        select MFD_CORE
+         ---help---
+          This driver supports the SDHI hardware block found in many
+          SuperH Mobile SoCs.
+
 config MFD_DM355EVM_MSP
         bool "DaVinci DM355 EVM microcontroller"
         depends on I2C && MACH_DAVINCI_DM355_EVM
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f3b277b90d40..d9522943d2fb 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_MFD_SM501)         += sm501.o
 obj-$(CONFIG_MFD_ASIC3)         += asic3.o
+obj-$(CONFIG_MFD_SH_MOBILE_SDHI)                += sh_mobile_sdhi.o
 
 obj-$(CONFIG_HTC_EGPIO)         += htc-egpio.o
 obj-$(CONFIG_HTC_PASIC3)        += htc-pasic3.o
diff --git a/drivers/mfd/sh_mobile_sdhi.c b/drivers/mfd/sh_mobile_sdhi.c
new file mode 100644
index 000000000000..56f72cc1d569
--- /dev/null
+++ b/drivers/mfd/sh_mobile_sdhi.c
@@ -0,0 +1,145 @@
+/*
+ * SuperH Mobile SDHI
+ *
+ * Copyright (C) 2009 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on "Compaq ASIC3 support":
+ *
+ * Copyright 2001 Compaq Computer Corporation.
+ * Copyright 2004-2005 Phil Blundell
+ * Copyright 2007-2008 OpenedHand Ltd.
+ *
+ * Authors: Phil Blundell <pb@handhelds.org>,
+ *          Samuel Ortiz <sameo@openedhand.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tmio.h>
+
+struct sh_mobile_sdhi {
+        struct clk *clk;
+        struct tmio_mmc_data mmc_data;
+        struct mfd_cell cell_mmc;
+};
+
+static struct resource sh_mobile_sdhi_resources[] = {
+        {
+                .start = 0x000,
+                .end   = 0x1ff,
+                .flags = IORESOURCE_MEM,
+        },
+        {
+                .start = 0,
+                .end   = 0,
+                .flags = IORESOURCE_IRQ,
+        },
+};
+
+static struct mfd_cell sh_mobile_sdhi_cell = {
+        .name          = "tmio-mmc",
+        .num_resources = ARRAY_SIZE(sh_mobile_sdhi_resources),
+        .resources     = sh_mobile_sdhi_resources,
+};
+
+static int __init sh_mobile_sdhi_probe(struct platform_device *pdev)
+{
+        struct sh_mobile_sdhi *priv;
+        struct resource *mem;
+        char clk_name[8];
+        int ret, irq;
+
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem)
+                dev_err(&pdev->dev, "missing MEM resource\n");
+
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0)
+                dev_err(&pdev->dev, "missing IRQ resource\n");
+
+        if (!mem || (irq < 0))
+                return -EINVAL;
+
+        priv = kzalloc(sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
+        if (priv == NULL) {
+                dev_err(&pdev->dev, "kzalloc failed\n");
+                return -ENOMEM;
+        }
+
+        snprintf(clk_name, sizeof(clk_name), "sdhi%d", pdev->id);
+        priv->clk = clk_get(&pdev->dev, clk_name);
+        if (IS_ERR(priv->clk)) {
+                dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
+                ret = PTR_ERR(priv->clk);
+                kfree(priv);
+                return ret;
+        }
+
+        clk_enable(priv->clk);
+
+        /* FIXME: silly const unsigned int hclk */
+        *(unsigned int *)&priv->mmc_data.hclk = clk_get_rate(priv->clk);
+
+        memcpy(&priv->cell_mmc, &sh_mobile_sdhi_cell, sizeof(priv->cell_mmc));
+        priv->cell_mmc.driver_data = &priv->mmc_data;
+        priv->cell_mmc.platform_data = &priv->cell_mmc;
+        priv->cell_mmc.data_size = sizeof(priv->cell_mmc);
+
+        platform_set_drvdata(pdev, priv);
+
+        ret = mfd_add_devices(&pdev->dev, pdev->id,
+                              &priv->cell_mmc, 1, mem, irq);
+        if (ret) {
+                clk_disable(priv->clk);
+                clk_put(priv->clk);
+                kfree(priv);
+        }
+
+        return ret;
+}
+
+static int sh_mobile_sdhi_remove(struct platform_device *pdev)
+{
+        struct sh_mobile_sdhi *priv = platform_get_drvdata(pdev);
+
+        mfd_remove_devices(&pdev->dev);
+        clk_disable(priv->clk);
+        clk_put(priv->clk);
+        kfree(priv);
+
+        return 0;
+}
+
+static struct platform_driver sh_mobile_sdhi_driver = {
+        .driver         = {
+                .name   = "sh_mobile_sdhi",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = sh_mobile_sdhi_probe,
+        .remove         = __devexit_p(sh_mobile_sdhi_remove),
+};
+
+static int __init sh_mobile_sdhi_init(void)
+{
+        return platform_driver_register(&sh_mobile_sdhi_driver);
+}
+
+static void __exit sh_mobile_sdhi_exit(void)
+{
+        platform_driver_unregister(&sh_mobile_sdhi_driver);
+}
+
+module_init(sh_mobile_sdhi_init);
+module_exit(sh_mobile_sdhi_exit);
+
+MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
+MODULE_AUTHOR("Magnus Damm");
+MODULE_LICENSE("GPL v2");